Steel alloy



Patented Oct. 5, 1926.

UNITED STATES PATENT OFFICE.

JOSEPH W. WEITZENKORN, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO MOLYB- DENUM CORPORATION OF AMERICA, PITTSBURGH, PENNSYLVANIA, A COR- PORATION OF DELAWARE.

STEEL ALLOY.

No Drawing.

In United States Patent No. 1,401,926, granted to George W. Sargent and me, there is disclosed a manganese steel alloy to which molybdenum is added with the result that the usual physical properties of manganese steel are intensified and its range o'l. heat treating temperatures greatly increased Without developing brittleness. The result- I ing manganese steel so disclosed contains not more than about .80 per cent carbon, from about 1.15 to 3.00 per cent manganese, and from about 1.00 to 1.25 per cent molybdenum, the remainder being iron with the exception of impurities and other elements customarily found in steel as the result of manufacturing processes.

The present invention relates to alloys such as disclosed in said patent, and is predicated upon my discovery that byincreasing the carbon content of the alloy there is produced an alloy having the characteristics of both iron and steel, and which is particularly suitable for the manufacture of hot Work articles, such as rolls for steel mills,

dies forforgings, etc.

Thealloy provided according to this invention contains from about .85 to 2.50 per cent carbon, from about 1.15 to 3.00 per cent manganese, and from a fraction of one .per

cent to 1.25 per cent molybdenum, the remainder being iron except for the usual amounts of other elements, such as sulphur, phosphorus, silicon and the like, which are ordinarily present as impurities or as in- Application filed March 30, 1926. Serial No. 98,618,

cidental to manufacturing processes. The sulphur and phosphorus should be as low as possible, while silicon and the like may be present to the extent usually found in most steels.

The alloyresembles iron in that it is very hard and Wear-resisting, and it resembles steel in that it is tough, strong and dense. In addition to these characteristics, the alloy is highly resistant to fire cracking, which, coupled with its hardness, renders it particularly well suited for use in the manufacture of hot work articles, such as have been mentioned.

In the manufacture of this alloy, it has been found advantageous to heatthe molten metal to a high temperature, for example from about 2800 to 3000 F., While in a furnace, and to cast it from as low a temperature as is commercially possible. In its solid state it may be-heat treated throughout a wide range of temperatures without developing brittleness.

JOSEPH W. W'EITZENKORN. 

